Wagon-dump.



1. 11. GILMAN.

WAGON DUMP.

APPLICATION FILED MAR. 7, 1910.

989,961. Patented Apr. 18,1911.

2 SHEETS-SHEET 1.

J. H. GILMAN. WAGON DUMP. APPLICATION FILED 11111117, 1910.

989, 961 Patented Apr. 18, 1911.

T 2 BHEETSPSHEET 2.

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JOHN H. GrILlVIAN, OF OTTAWA, ILLINOIS, ASSIGNOR T0 KING 85 HAMILTONCOMPANY, OF OTTAWA, ILLINOIS, A CORPORATION OF ILLINOIS.

WAGON-DUMP.

Specification of Letters Patent.

Patented Apr. 18, 1911.

To all whom it may concern:

Be it known that I, JOHN H. GILMAN, a citizen of the United States, anda resident of Ottawa, in the county of Lasalle and State of Illinois,have invented certain new and useful Improvements in IVagon-Dumps, ofwhich the following is a full, clear, and exact specification.

My invention is concerned with wagon dumps of that class in which theelevating platform or support in its downward movement operates thetripping mechanism for stopping the gearing, and is designed to producea device of the classdescribed in which if the platform, through anyaccidental obstruction fails to descend far enough to operate thetripping mechanism,

' no harm will result from the continued operation of the gearing.

To this end,'my invention is embodied in a novel combination of elementswhich I will describe in detail in the specification proper and pointout particularly in the claims.

To illustrate my invention, I annex hereto two sheets of drawings, inwhich the same reference characters are used to designate identicalparts in all the figures, of which,-

Figure 1 is a side elevation of the gearing end of the dump; Fig. 2 is adetail in central, vertical section looking toward the gearing end ofthe dump; Fig. 3 is a plan view in section on the line AA of Fig. 1,through the gearing end of the dump; Fig. 4 is a detail in section onthe line BB of Fig. 1; and Fig. 5 is a detail in section on the line CCof Fig. 3.

In the general construction of these devices, a base is formed of theend pieces 10, the lower longitudinal pieces 11, and the upperlongitudinal pieces 12 secured thereto. Extending upward from each endof the base is a side frame composed of the upright standards 13, thetop cross-piece 14, and these side frames are preferably braced by therods 15 secured thereto and to the pieces 12. On the top of each of theside frames is suitably journaled a sheave 16, over which passes thechain 17, one end of which is secured to the shaft 18, preferably so asto be wound up upon a drum 19 secured to each end of the shaft, theother end of the chain being secured to the bail 20, which has its endsfastened to the end cross-pieces 21, which together with thelongitudinal pieces 22 make up the customary frame upon which the frontwheels of the wagon rest when the dump is in operation. With theconnections thus far described, it will be obvious that if the shaft 18is rotated in one direction, the chains 17 will be wound up upon thedrums 19, thereby lifting the frame, with the front wheels of the wagonthereon; and when the shaft is rotated in the other direction, thechains will be unwound, allowing the front of the wagon to descend.

The power is applied to a shaft 23, which is connected by auniversaljoint 24 with a shaft 25, best seen in Fig. 3, which shaft is journaledin suitable bearings 26 and 27 formed in and secured to the framecasting 28. The shaft 25 has splined thereon a clutch member 29 havingtwo clutch faces adapted to coiiperate alternately with similar clutchfaces on the pinion 30 and the worm 31, which has secured thereto orformed integrally therewith the spur gear wheel 32. The pinion 30 mesheswith an idle pinion 33 journaled on the bearing stud 34, and this idlepinion in turn meshes with a pinion 35 secured on the shaft 36, as bestseen in Fig. 5. This shaft 36 is journaled in suitable bearings 37 and38 formed on and secured to the frame casting 28, and it has at itsother end the gear wheel 39, which meshes directly with the spur gearwheel or pinion 32, so that it will be apparent that if the clutch 29engages with the pinion 30 (it and the worm gear 31 beingv looselyournaled on the shaft 25), the shaft 23 will rotate the worm 31 at acomparatively high speed to lower the frame, while if the clutch 29 isengaged with the worm 31, the latter will be rotated directly at a lowerspeed to raise the frame. In the firstcase, the drive from the shaft 25to the worm 31 is through the clutch member 29, pinion 30, idler 33,pinion 35, shaft 36, spur gear wheel 39, and spur gear pinion 32 securedto the worm 31. In the second case, the drive is directly from the shaft25 through the clutch member 29 to the worm 31, which rotates in theopposite direction, with the wheels and pinions 39, 35, 34 and 30rotating idly. The worm 31 meshes with the worm wheel 40 loosely mountedon the shaft 18, which has slip clutch teeth 41 on its hub meshing withsimilar slip clutch teeth 42 on the clutch member 43, which has thesquare aperture coiiperating with the squared end 44 of the shaft 18. Ahelically-coiled expandingspring 45 is interposed between the clutchmember 43 and a washer 46 held on the end of the shaft 18 in anysuitable manner, as by the cotter pin 47. When the shaft 18 is rotatedby the worm in the proper direction to raise the load, the square facesof the clutch teeth 41 and 42 are in engagement, so that the load islifted positively without any chance of slipping. When the shaft isrotated in the opposite direction to lower the wagon, the inclined facesof the clutch teeth 41 and 42 are held in engagement by the spring 43,and it will be obvious that if there is any obstruction to the rotationof the shaft 18, the inclined faces of the teeth'41 cooperating with theinclined faces of the teeth 42 will simply force the clutch member 43outward against the tension of the spring 45, permitting the shaft torest despite the continued rotation of the wheel 40.

The tripping mechanism for operating the clutch member 29 consists of abel crank lever having the vertical arm 48 and the horizontal arm 49,the lever being pivoted to the cross piece 50 secured to the uprights 13at 51. The vertical arm 48 is provided with the fork 52, which engageswith the annular groove in the clutch member 29 in the customary manner,so that when the lever 48 is in either one of its three positions, theclutch member will be free, or engaged with either the pinion 30 or theworm 31, as the case may be. The arm 49 has secured to its outer end therod or bar 53, which extends upward and is provided with an adjustablesleeve or collar 54 thereon, with which the horizontal arm 55 of theangular piece 56 bolted to the frame 22 engages to automatically rockthe bell crank 48, 49 in the proper direction to unclutch the member 29from the worm 31 and stop the upward movement of the frame.

When the frame descends, the arm 55, through which the bar 53 passes bymeans of a slot, as seen in Fig. 3, engages the adjustable collar 57,57, seen in dotted lines in Figs. 2 and 3, and rocks the bell crank 48,49 in the opposite direction to disengage the clutch member 29 from thepinion 30 and stop the downward movement of the frame. The bell crank48, 49 is shifted manually by means of the bar 58 pivoted thereto andextending to the other end of the wagon, so as to be convenient formanipulation by the driver.

The operation of the complete apparatus will be readily understood fromthe foregoing description, and it will be obvious that if for any reasonthe platform should fail to descend to the full distance sufficientlyfor the arm 55 to engage the stop 57 and uncouple the driving gearing,no dam age will be done by the continued movement of the gearing, forthe reason that the shaft 18 will stop, and the continued rotas tion ofthe wheel 40 will simply force the clutch member 43 outward against thetension of the spring 45, causing the teeth 41 and 42 to slip idly overeach other.

l Vhile I have shown and described my invention as embodied in the formwhich I at present consider best adapted to carry out its purposes, itwill be understood that it is capable of modifications, and that I donot desire to be limited in the interpretation of the following claimsexcept as may be necessitated by the state of the prior art.

\Vhat- I claim as new, and desire to secure by Letters Patent of theUnited States, is:

1. In a wagon dump, the combination with a vertically movablewagon-support, of a reversible driven shaft, connections between thesupport and the shaft by which as the shaft is rotated in one directionthe support is raised and as it is rotated in the other direction thesupport is lowered, a driving shaft adapted to rotate continuously inone direction, and reversible driving connections between said shafts,said driving connections operating to drive by a direct engagementin-one direction and by a frictional engagement in the other.

2. In a wagon dump, the combination with a vertically movablewagon-support, of a reversible driven shaft, connections between thesupport and the shaft by which as the shaft is rotated in one directionthe support is raised and as it is rotated in the other direction thesupport is lowered, a driving shaft adapted to rotate continuously inone direction, and reversible driving connections between said shafts,said driving connections including a pair of ratchet-toothed clutchmembers, and a spring pressing said members together.

3. In a wagon dump, the combination with a vertically movablewagon-support, of a reversible driven shaft, connections between thesupport and the shaft by which as the shaft is rotated in one directionthe support is raised and as it is rotated in the other direction thesupport is lowered, a driving shaft adapted to rotate continuously inone direction, reversible driving connections between said shafts, andtripping mechanism combined with said driving connections and adapted tobe operated by the support in its downward movement to disengage saiddriving connections and stop the movement of the driven shaft, saiddriving connections operating to drive by a direct engagement as thesupport is raised and by a frictional engagement as it is lowered.

4. In a wagon dump, the combination with a vertically movablewagon-support, of a reversible driven shaft, connections between thesupport and the shaft by which as the shaft is rotated in one directionthe support is raised and as it is rotated in the other direction thesupport is lowered, a

driving shaft adapted to rotate continuously in one direction,reversible driving connections between said shafts, and trippingmechanism combined with said driving connections and adapted to beoperated by the support in its downward movement to disengage saiddriving connections and stop the movement of the driven shaft, saiddriving connections including a pair of ratchettoothed clutch membersand a spring pressing said members together, the teeth of said clutchmembers being directed so that the driven shaft is driven by a directengagement as the support is raised and by a frictional engagement as itis lowered.

In witness whereof, I have hereunto set my hand and affixed my seal,this 3rd day of March, A. D. 1910.

' JOHN H. GILMAN. [1,. s.]

Witnesses:

AUGUST LEDRIOH, EDWARD R. CLAUS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

